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Hollywood Hills Speedway 2008 Hobby Stock Rules

Printable Version

   The vision for the Hobby Stock class is to provide an avenue for the participants to build racecars that are more technically advanced than the Cruiser division.
 

   The Hollywood Hills Speedway, Hobby Stock rules are designed to encourage a safe, competitive stock car class that allows a limited amount of modifications, while keeping in mind the economic nature of the division.
 

   In no way will the rules be interpreted to allow a car that is technically superior to dominate the class or to be constructed in an unsafe fashion that poses a danger to the operator or other competitors.

The word “STOCK” means: unaltered and as originally produced for that year, make, and model, including aftermarket replacement parts.

WEIGHT LIMIT:  The MINIMUM weight allowable for cars competing in the Hobby Stock class is 3,250 pounds including driver, NO TOLERANCE.

The Hollywood Hills Track scales will be the official standard.

 ** Ignorance of the rules is not an acceptable excuse for non-compliance **

A.          BODIES:

EXTERIOR:

1. 1960 or newer American made front engine, rear wheel drive passenger cars only.  NO convertibles, station wagons, pick-up or sedan delivery bodies allowed.

2. Bodies must be stock appearing and use 100% OEM body panels, mounted in the original location on the chassis.

3. Doors must be securely welded or bolted shut.

4. Fenders may be trimmed for reasonable tire clearance only and all edges must be rolled.  Inner fenders may be removed.

5. Hood and trunk must remain stock and be securely fastened with 7/16” minimum hood pins.

6. Air cleaners may not protrude through the hood.  Only factory hood scoops are allowed and must be correct for year, make and model of body.

7. All glass, plastic, upholstery, rear seat, lights, mirrors and chrome must be removed.

8. OEM bumpers are required and may be reinforced with steel tubing (2 ½” maximum diameter).  OEM plastic nosepiece is optional, but must have OEM bumper intact.  Bumper ends must be attached to body using a minimum of 3” wide steel strap.

9. OEM roof with stock window posts are required.  A windshield center post (1” diameter minimum) is mandatory.

10. Window openings must remain stock dimension (plus or minus 1”).

11. Windshield opening must be protected with hardware cloth, expanded metal or 4 vertical bars ½ inch outside diameter.  A screen over entire opening is recommended with extra bars in front of driver.

12. Sun visor allowed on windshield only.

13. Cars with excessive body damage will be required to have body parts replaced or repaired to the tech committee’s satisfaction.

14. Car numbers and lettering must be displayed in contrasting colors and must be easy to read by track officials while on the racing surface.

INTERIOR:

1. Original floor pan in the driver’s compartment (dash to rear package deck) must remain intact and be in factory location.

2. All holes in firewalls and floor pan must be covered with sheet metal.

3. Fuel lines that run through the interior will be encased in steel tubing.

4. Trunk area floor pan may be removed.
    

B.          CHASSIS:

1. Must be correct for year, make and model of body and may be reinforced, but not reconstructed, redesigned or altered beyond original factory concept.

2. Uni-Body cars must have front sub frame tied rear frame section using steel (round or square) tubing.

3. Front and rear of frame must be equipped with tow loops of sufficient in strength to lift car and must be easily accessible for towing operations.
    

C.          SUSPENSION:

1. Front and rear suspensions are to remain factory stock in design and location.

2. Tubular upper control arms are allowed, but must utilize factory mounts.

3. NO: coil over or bearing end shocks, spring eliminators or sliders allowed.

4. Any steel shock or spring is allowed, but must remain in factory location.

5. Auxiliary shock is allowed on right front suspension only.

6. A nine-inch Ford rear end is optional in any chassis, but must utilize factory-mounting hardware in stock location.
    

D          ROLL CAGE:
Full cage-type roll bars are required and must meet the following specifications:

1.      Main cage, door bars, halo, rear “kicker” bars, and dash bar must be minimum of 1 ½ inch OD, .090 thickness steel tubing.

2.      A 6-point roll cage with gussets at right angle welds on main cage required.

3.      Driver’s side door must have minimum of two (2) horizontal bars, running from front upright to rear upright of cage, equally spaced from window opening to frame. Ladder or x bracing required on all door bars, (gussets recommended).

4.      Passenger side door must have 2 bars minimum, of parallel, x or z design.

5.      A horizontal bar must be placed between 2 front upright bars at dash height.

6.      A bar must be placed vertically from center of horizontal dash bar to front center of halo in windshield opening and must be (1) inch diameter (minimum) tubing.

7.      Front hoop and additional bars to strengthen main cage recommended and are subject to tech committee approval.

8.      Roll bars in vicinity of driver must have padding.

E.          ENGINE:

1. General Specifications:

a.                  MUFFLERS are MANDATORY: Must be stock or aftermarket “turbo” style, NO modifications, NO glass pack mufflers allowed, MUST be welded, 2 ½” maximum I.D. exhaust system must extend beyond drivers seat.  Any car losing a muffler will be disqualified from race.

b.                  Pump or racing gasoline only. No additives allowed.

c.                  Electric fuel pumps allowed, but must have oil pressure switch.

d.                  Engine must be mounted with forward most sparkplug hole on centerline or forward of upper ball joints.

e.                  Engine must be of the same manufacture as the body and chassis.

f.                    Block, cylinder heads, intake and exhaust manifolds must be cast iron production parts and standard equipment on factory produced passenger cars.

g.                  Stock replacement flat top or dished pistons only.

h.                  Block, crankshaft and connecting rods must be from the same engine type and displacement (such as 350-Chev to 350-Chev, etc).

i.                    No stroking allowed.

j.                    Stock two (2) barrel (500 CFM Max) carburetor and manifold required.

k.                  Carburetor spacer optional, (1 ½” max height only).

l.                    Any radiator may be used; must mounted in front of engine and have a fan shroud.

m.                No engine cooling systems allowed in the driver’s compartment.

2. The Following Non Stock/After Market Parts Are Allowed:

a.                  Gauges and switches

b.                  Spark plugs and ignition coils and wires

c.                  Factory replacement HEI distributors

d.                  Air Cleaners

e.                  Valve covers

f.                    Distributor cap and rotor

g.                  Non roller cam shaft

h.                  Roller timing chains

i.                    Valve springs and retainers

j.                    Pushrods

k.                  Pushrod guide plates

l.                    Screw-in or pinned rocker arm studs

m.                Any non-roller/non-roller tip rocker arms

n.                  Cam thrust buttons

3. The Following Items Are NOT ALLOWED.

a.                  Vortec or after market heads (i.e. Bowtie, Dart, SVO, etc).

b.                  Roller cams or roller-tip rocker arms.

c.                  Solid valve lifters of any type

d.                  Fuel injection, turbochargers, supercharges or nitrous oxide.

e.                  After market ignition systems, magnetos or computers.

f.                    Headers of any type

g.                  High-rise or performance-type intake manifolds

h.                  Gear drive camshafts (except production 6cyl)

i.                    Aluminum flywheels

j.                    Porting and/or polishing off intake or exhaust passages or heads

k.                  Off-set ground crankshafts

l.                    Angle-milled heads

m.                Aluminum rods

n.                  Aluminum or carbon fibered drive shafts.

F.          DRIVE TRAIN:

1.      Automatic or manual shift OEM transmissions only.

2.      Torque converters are required on automatic transmissions.

3.      Bell housing area must be plated to protect the driver area subject to tech committee approval.  Shatter shields or blow proof bell housings are recommended on all manual transmissions.

4.      No buttons, dog clutches or quick-change devices allowed.

5.      Only steel drive shafts allowed.

6.      All cars must have operational forward and reverse gears.

7.      With engine running, cars must demonstrate forward and reverse movement at the tech committee’s request.

8.      Four (4) wheel operational brakes are mandatory.

9.      No brake shut off, proportioning valves allowed.

G.          WHEELS:

1. Steel wheels only, eight (8) inch Maximum width allowed.

2. Right side wheels must be reinforced.

3. Aftermarket and racing wheels are allowed.

4. No bead lock wheels.

5. No wheel weights allowed.

6.  

H.          TIRES:

1. D.O.T. passenger car (for highway use) tires only.

2. No racing tires or D.O.T. stamped racing manufactured tires allowed.

3. Cross grooving is allowed.

4. Maximum legal tire width is 9 ½” at the sidewall with racing tire pressure.

5. The track tire width gauge will be the official standard measurement tool.
    

I.           SAFETY:
1.      DRIVER:

a.                  An approved full face helmet SA-95 or newer must be worn any time a car is under power and moving.

b.                  A minimum, SFI approved single layer fire suit, SFI approved shoes, and SFI approved gloves must be worn.  Double layer suits or single layer suits with “nomex” underwear are highly recommended.

c.                  Approved aluminum or steel racing seat only allowed.  Must be mounted to the roll cage at a minimum of 4 places (2 on back, and 2 on seat) using minimum 3/8” grade 8 bolts and large washers or steel straps.

d.                  A five (5) point safety harness with a minimum 3” wide webbing is mandatory and must have a single point release mechanism.  Belts must be mounted with manufactures hardware to roll cage or frame, using a minimum 3/8” grade 8 bolts.  Belts cannot be weathered appearing or older than 4 years.

e.                  A 2-½ pound fire extinguisher must be securely mounted in cockpit area within easy reach of driver.

f.                    A SFI approved nylon mesh type window net must be installed in driver’s window opening.  Must have accessible quick release mechanism.  Release point must be clearly marked.

2.      BODY/CHASSIS:

a.                  Drive shaft must be painted white and cleaned periodically.

b.                  A drive shaft restraint, either chain, or steel strap loop of 2” x 1/4” material must be mounted to floor pan around driveline within 4” to 12” from front u-joint.

c.                  Battery must be completely enclosed in a steel or high impact plastic box and must be securely mounted to tech committee’s approval.

d.                  A mandatory master kill switch will be mounted between the left side of the seat and the driver’s door.

e.                  Kill switch must be accessible to the safety crew and clearly marked by a 3” arrow.

f.                    Any ballast shall be mounted to the roll cage or chassis using a minimum, ½” bolts.

g.                  All ballast must be painted white and have car number marked on it.

h.                  Cars loosing ballast on racing surface will be disqualified from race.

i.                    Fuel tanks will be removed and replaced by an approved fuel cell.

j.                    Fuel cells must be securely mounted with steel straps inside the trunk.

k.                  Cars with trunk floorboards removed must have fuel cell mounted in a steel container.

====== RULE ENFORCEMENT AUTHORITY ======

   The Hobby Stock tech committee in concert with the Hollywood Hills Speedway competition director will have the final interpretation authority of these rules.

   The tech committee will impound the top four finishers of the main event for tech inspection purposes.

   The tech committee will perform random inspections to ensure that cars are in compliance with the rules.

   NOTICE:  Cars that fail to meet the minimum safety requirements outlined in this document will not be allowed on the racing surface until the infraction(s) are corrected to the approval of the tech committee.

2009 Special Events